Control system



A. H. CANDEE.

CONTROL SYSTEM.

APPLICATION FILED AUG-3, 1917.

1 ,354, 1 67, PatentedSept. 28, 1920.

Andrew/160M ymw/ BY WITNESSES: F

UNITED STATES 9ATENT QFFICE.

ANDREW I-I. CANDEE, OF PITTSBURGH ELECTRIC & MANUFAGTURING Applicationfiled August 3, 1917. Serial No.

To all whom it may concern Be it known that I, ANDREW H. CANDEE acitizen of the United States, of Pittsburgh, 1n the count and State'or'Pennsylvania, 1

PENNSYLVANIA, ASSIGNOR TO COIIIPANY, A CORPORATION OF PENNSYLVANIA.

WESTINGHOUSE CONTROL SYSTEM.

Specification of Letters Patent.

1 and a resident of Allegheny ave invented a new and useful Improvementin Control Systems, of which the followi cation.

ng is a specifi- My invention relates to systems of control andparticularly operating mining One object of a system of controlcontrollers, which are located to systems sitions relative to eachother,

of control for locomotlves. my invention 1s to provide embodying aplurality of in various pothat shall be interlocked in a'manner toprevent injurious simultaneous operation thereo Another olo ect of myvide a control system cha cter that shall have two invention is to proofthe above indicated controllers for governing the operation of the motoror motors contained therein, and el ectrically controlled locking meansfor preventing the operation of the mined conditions.

not-her object controllers under predeterof my invention is to provide acontrol system that shall embody a main controller for governing thetion of the motors contained an ftllXlllfllj controller direction ofrotation of for accelera- 1n the system, governing the the motors andthe circuit relation of the motors relative to each other. andelectrically opei .ted means asso ciated with the two controllers forpreventlng movement of the main co predetermlned conditions.

ore specifically,

ntroller under my invention embodies a control system having a pluralityof motors, a main controller for celeration of the motors. trollerlocated remote troller for connecting and in parallehcircuit governingthe acauxiliaiw confrom' the main conthe motors in series relation andfor governin the direction of rotation of the II10 tors, and a masterreverser disposed achacent to and mechanically interlocked with the maincontroller and adapted electrical-interlocking system main controllerand the in order to prevent the operati to control an between theauxiliary control er on of the main controller until the auxiliarycontroller is moved to a ter reverser.

position determined by the mas- In many control systems. andparticularly in controlsystems for minin g locomotives,

Patented Sept. 28, 1920.

it is inconvenient and, in many cases, impossible to locate the variouscontrollers in close proximity to each other and in such case, it isnecessary to utilize complicated and cumbersome mechanical interlockingmeans for interlocking the various control lers.

In a system constructed in accordance with my invention, the variouscontrollers are interlocked by electrically controlled means in orderthat they may be located in any convenient relation relative to eachother.

In the accompanying drawing, Figure l is a diagrammatic view of acontrol system constructed in accordance with my invention and Fig. 2 isa plan view of the main controller and the master reverser illus tratedin Fig. l of the drawing.

eferring to the accompanying drawing, two motors 1 and 2, respectivelyembodying armatures A1 and A2 and field windings F1 and F 2 are adaptedto be connected in series with resistors R1 to R6, inclusive, across asupply circuit, embodying a trolley conductor 3 and a ground returnconductor 4 by means of a main controller 5 and an auxiliary controller6. The main controller 5 embodies a contact segment 7 which is adaptedto engage contact fingers 8 to 15, inclusive, in positions a to g,inclusive, for short circuiting the resistors R1 to R6, inclusive.

The auxiliary controller 6 embodies an interlocking drum 16 and areversing drum 17 e reversing drum 17 embodies a plurality of contactsegments 17 to 26, inclusive., which are adapted to engage contactfingers 27 to 36, inclusive, when the controller is moved to positions aand I) which respectively correspond to the forward serice and theforward parallel positions of the motors. A plurality of contactsegments 37 to 43. inclusive. are provided for engaging the contactfingers 27 to 36, inclusive. when the auxiliary controller is moved topositions 0 and (Z, which respectively corre spond to the reverse seriesand the reverse parallel positions of the motors.

The interlock drum 16 of the auxiliary controller 6 embodies a contactsegment 44 which is adapted to engage contact fingers 45 to 49,inclusive, and to cooperate with a master reverser 50 for governing theenergization of a coil 51, when moved through accelerated by movingelusive, armature tact segment 1S-armature A2,

positions a, b, c and d. The coil 51 is adapted to operate aninterlocking means 52 for'the main controller 5, as will be set forthlater. A plurality of interlocking means 53 to 56, inclusive, areprovided for coeperating with a recess 57 in the auxiliary.

controller 6 in order to hold the latter in its various operativepositions under predetermined conditions. The interlocking means to 56,inclusive, respectively embody plungers 58 to 61, inclusive, which areoperated in one direction to enter the recess 57 by the springs 62 andare operated in a reverse direction by means of coils 63 to 66,inclusive. The master reverser 50 embodies a contact segment 67 which isadapted to engage contact fingers 68 to 72, inclusive, when movedthrough positions a, b, c and d.

Referring to Fig. 2 of the drawing, the main controller 5 ismechanically interlocked with the master reverser 50 by means of aninterlock 73. The interlock 73 embodies a plunger 7 1, which cooperateswith a cam ring 75 of the main controller 5 and with recesses 76 whichare formed in a ring 77 of the master reverser 50. In the off positionof the main controller 5, the

plunger 74 is projected into a recess 78 of the cam ring 75 by means ofa spring 79 in order to permit free movement of the master reverser 50but in any other position of the main controller, the plunger 74 isprojected by means of the cam ring 75 into one of the recesses 76 of thering 77 in order to prevent movement of the master reverser hile themain controller is in an operative position. The locking means 52embodies a plunger 80 which coeperates with a ring 81 of the maincontroller having a recess 82 therein and is operated in one directionby the coil 51 and in the opposite direction by a spring 83. V

7 Assuming the main controller 5 to be in position a and the auxiliarycontroller to be in position a, which is the forward series position, acircuit is completed from the trolley conductor 3 through the contactfingers 8 and 9-which are bridged by the contact segment 7-resistors R1to R6, in-

Al, contact fingers 29 and 30-which are bridged by the contact segment20-field windings F1, contact fingers 28 and 31which are bridged by thecon- 7 contact fingers 34 and 35-which are bridged by the contactsegment 25-field winding F2 and contact fingers 32 and 33which arebridged by the contact segment 23-t0 the ground return conductor 4. Themotors are connected in series relation for operation in a forwarddirection and may be the main controller through positions a to g,inclusive, in order to short circuit the resistors R1 'to R6, in-

clusive.

. interlocking means In case it is desired to operate the motors 1 and 2in parallel-circuit relation and in a forward direction, the maincontroller 5 is moved to position (4 and the auxiliary controller 6 ismoved to position bwhich .is its forward parallel position. A circuit iscompleted from the trolley conductor 3 through the contact fingers 8 and9-which are bridged by the contact segment 7-resistors R1 to B6,inclusive, where the circuit divides, one branch extending through thearmature A1, contact fingers 29 and'30 which are bridged by the contactsegment 19-field winding F1, contact finger 31 and contact segments 21and 26 to the ground return conductor 4, and the second branch extendingthrough contact fingers 27 and ,28-which are bridged by the contactsegment 17'-armature A2, contact fingers 34 and 35-which are. bridged bythe contact segment 24-field winding F2 andthe contact fingers 32 and33-which are bridged by the contact segment 22to the ground returnconductor 1. The motors 1 and 2 are connected in parallel circuitrelation and may be further accelerated by moving the main controller 5to short circuit the resistors B1 to R6, inclusive. 7

In position 0' of the auxil ary controller 7 6, the motors 1 and 2 areconnected in series- .circuit relation for operation in a reversedirection and, in position cl of the auxiliary controller, the motors 1and 2 are'connected in parallel-circuit relation for operation in areverse direction. The circuits formed threughthe motors land 2 inpositions 0 and d of the auxiliary controller differ from the circuitformed through the motors 1 and '2 in positions a and 50f the auxiliarycontroller only in the position of the field windings F1 and F2 relativeto and A2 and, accordingly, it is deemed unnecessary to completely tracethe circuits through the motors when the auxiliary controller is inposition 0 or in position (Z.

Assuming the main controller 5 to be in the off position, the mechanicalinterlocking means 73 will permit the free movement of the masterreverser 50, and the auxiliary controller 6 may be moved to any of theoperativepositions for operating the motors in series and in parallelcircuit relation and in a forward and in a reverse direction. In casethe master reverser 50 is moved to position a and the auxiliarycontroller 6 is in the oil position, it will be noted that the 52will beoperated to prevent any movement of the main controller 5 from the ofiposition until the auxiliary controller 6 has'been moved to position a.When the master reverser 50 is in position a, a circuit is completedfrom one terminal of the battery B through the coil 51" of theinterlocking means may be tracedthrough the contact fingers 52 which thearmaturesfAl V 68 and 70-Which are bridged by the contact segment67contact fingers l6 and 49 'Wl1iCl1 are bridged by the contact segment44-and the coil 51 to the other terminal of the battery B. are completedthrough the operating coils 63, 6% and 65 of the interlocking means 53,5a: and in order to hold the plungers 58, 59 and 66 from entering therecess 57 when the controller is moved through positions Z), c and (5,It Will he noted that the coil 66 of the loclr56 is dee'nergized andthat the plunger 61 is moved by its associated spring 62 into the recess57 when the auxiliary controller is moved to position a. In moving theauxiliary controller 6 from the oil position to position a, it will benoted that the circuit of the coil 51 is completed through the contactfinger 46 and the contact seg-. position of the con ment at in the oiltroller, and that in position a of the'auxiliary controller the coil 51of the auxiliary switch is deenergized by reason of the contact finger46 being disengaged from the contact segment 44:.

in case the master reverser is moved to position Z), the interlockingmeans Will operate to hold the auxiliary controller 6 in position 3)until further movement or" the r reverser, and in positions 0 and at ofter reverser, the interlocking means i 5 iwill operate to maintain theauxcontroller 6 in positions correspond- .ereto. "one the abovedescription, it will be noted that the mechanical interlock 73 serves toprevent movement of the master reverser 5") when the main controller 5is in an operative position. The interlock 52, Which is vith theinterlock drum 16 of the controller (5 and the master reprevent movementof main controller until the auxiliary ler 6 in a position correspondingthe position t the master reverser 50. nterloclrs 5 to 56, inclusive,which are a i t d with the auxiliary controller 6, erve to lock theauxiliary controller in a position corresponding to the position of theIll-""iIQI. \61861 when moved thereto.

' cations in the system and arrange- 1 location or parts may be made thespirit and scope of my invention such modifications are intended to becovered by the appended claims.

I claim as invention:

1. In a system of control, the combination Moreover, parallelcircuitsthe master reverser when the main controller is in an operativefor preventing the operation of the main controller until the auxiliarycontroller is in a position corresponding to the position of the masterreverser. v

2. in a system of control, the combination with a plurality of motors, amain controller for governing the acceleration of the motors, an auliary controller for operating the motors in eries and in parallelcircuit relation and in a forward and in a reverse direction, of amaster reverser, means for preventingmovement of the master reverserwhen the main controller is in an operative position, and means forholding the main controller in the off position until the masterrevers'er and the auxiliary controller occupy corresponding positionsand for holding the auxiliary controller in a position corresponding tothe position of the master reverser until the position of the masterreverser is changed.

3,111 a system of control, the combination With a plurality of rotatablecontrol uns, of plural locking means correspondng to different positionsof one drum and operative in a direction transverse to the r t' rivemovement thereof, said means hei successively governed by another drum.

in a ystem oi control, the combination with a plurality of rotatablecontrol drums, plural means biased to lockingly engage the end surfaceof one drum in different positions thereof, said means beingsuccesposition, and means sively electrically released by another drum.

I have hereunto my name this 17th day of July ANDREW H. OANDEE.

